Captain of medium large transport air carrier aircraft took evasive action in response to a TCASII R...

Attributes
ACN	236808
Time
Date	199303
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : rod
State Reference	OH
Altitude	msl bound lower : 23800 msl bound upper : 25000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi
Experience	flight time last 90 days : 180 flight time total : 13000 flight time type : 7500
ASRS Report	236808
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 2200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Cleared to FL250 by ZID due to oncoming traffic at FL260, our 11 O'clock position, 15 mi. We were IMC. The TCASII gave a TA, 'traffic, traffic' and displayed traffic at 11 O'clock, about where the FL260 traffic was called by cle. I was hand flying the aircraft and as I began the level off at FL250 the TCASII gave an RA 'descend, descend.' the radar target was inside the 10 NM ring and was colored red indicating a conflict. The vertical speed indicator lights commanded an 1800-2000 FPM rate of descent which was immediately initiated. TCASII indicated 'clear of conflict' as we approached FL240. I accomplished the level off at 23800 ft and climbed the aircraft back to FL250. We called ZID and told them of our TCASII commanded deviation. They were busy and never did acknowledge our transmission, nor did they remark/inquire about our altitude deviation. We were IMC during the entire incident and never had actual visual contact with the reported or TCASII traffic.

Original NASA ASRS Text

Title: CAPT OF MLG ACR ACFT TOOK EVASIVE ACTION IN RESPONSE TO A TCASII RA DURING CLB.

Narrative: CLRED TO FL250 BY ZID DUE TO ONCOMING TFC AT FL260, OUR 11 O'CLOCK POS, 15 MI. WE WERE IMC. THE TCASII GAVE A TA, 'TFC, TFC' AND DISPLAYED TFC AT 11 O'CLOCK, ABOUT WHERE THE FL260 TFC WAS CALLED BY CLE. I WAS HAND FLYING THE ACFT AND AS I BEGAN THE LEVEL OFF AT FL250 THE TCASII GAVE AN RA 'DSND, DSND.' THE RADAR TARGET WAS INSIDE THE 10 NM RING AND WAS COLORED RED INDICATING A CONFLICT. THE VERT SPD INDICATOR LIGHTS COMMANDED AN 1800-2000 FPM RATE OF DSCNT WHICH WAS IMMEDIATELY INITIATED. TCASII INDICATED 'CLR OF CONFLICT' AS WE APCHED FL240. I ACCOMPLISHED THE LEVEL OFF AT 23800 FT AND CLBED THE ACFT BACK TO FL250. WE CALLED ZID AND TOLD THEM OF OUR TCASII COMMANDED DEV. THEY WERE BUSY AND NEVER DID ACKNOWLEDGE OUR XMISSION, NOR DID THEY REMARK/INQUIRE ABOUT OUR ALTDEV. WE WERE IMC DURING THE ENTIRE INCIDENT AND NEVER HAD ACTUAL VISUAL CONTACT WITH THE RPTED OR TCASII TFC.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Captain of medium large transport air carrier aircraft took evasive action in response to a TCASII RA during climb.